Apparatus for rolling seamless tubes



March 5, 1935. w. WIDUCH APPARATUS FOR ROLLING SEAMLESS TUBES Filed Aug. 12, 1932 n WWW 3% l w m o o .6 W w I x b o 0 Nu N \& r [W L ERR. a Q Q w. B0 H m W. N l

Patented Mar. 5,1935 7 UNITED STATES PATENT OFFICE APPARATUS FOR ROLLING SEAIMLESS TUBES I Wilhelm Widuch, Wielkie Hajduki, Poland; as-

- signor to Karl Brehme, Hollister, Calif.

Application August 12, 1932 Serial No. 628,603 In Germany March 17, 1931 2 Claims. (CI. 8013) Patent applications have been filed in the fol- .by a special drive against the rollers or vice versa lowing foreign states: Germany, Serial W; 85 the feeding of the roller mechanism against the 393 1/72., filed March 17, 1931 (not yet granted) .piece under treatment is according to the inven-- and Poland, Serial No. 35 473/ 18 038, filed August tion so regulated that it is adapted to the draw- 'ing which the rollers, especially the cylindrical 5 The invention concerns a process and appapart of the same, exert on account of their more ratus for drawing strong walled hollow sleeves or less oblique arrangement on the piece whichor hollow blocks into seamless tubes by slope is set in rotation, since the slope rollers naturally, rolling. 1 since they are not driven, rotate with the rotatl0 ,In the hitherto known slope rolling process, 'ingbody. Thereby damage to the texture of the 10 the force bringing about the rolling process conproduct caused by the drawing effect of the skew sists usually exclusively or mainly in the torque rollers is avoided. The drawing illustrates by applied to the rolls. In the known skew,v rolling way of example, a skew rolling mill constructed apparatus, the driven rollers have usually the according to the invention. form of .one or more conical frustums, and on Figure 1 is an elevation partly in sectionof 15 account of the slanting position of their axes therolling mill. of rotation to the long axis of the piece under Figure 2 is a plan view of Fig. 1. treatment exert a pull as well as a rotary action The two skew rollers aand a, of which three on the latter, by which an internal'overstrain of or more can be provided with workpieces of the material is brought about. large size are adjustably'arranged in known man- 20 According to the invention the manufacture ner in a suitable bearingapparatus which for of seamless tubes by slope rolling of pre formed the sake of clearness is not shown in the drawing. hollow bodies arranged on a mandrel is carried Each'roller consists of loose rotatable rings 17 out by setting into rotation the hollow body and an independently rotatable cylindrical part gripped by a gripping apparatus and-the manwhich is either loosely mounted on the roller axle 26 drei, and the freely running skew rollers are fed k or fastened thereto. v v by a shoving forward of the piece under treat- The hollow body b to be rolled is fixed on a ment efiected by aspecial drive. Instead of a mandrel d and is gripped in a chuck e. This shoving forward of the piece undertreatment fastening can also be effected in a simpler manshoving forward of the roller mechanism against angularly and the hollow body pressed thereon. the hollow body, which has been set in rotation. In the rolling process, the rotatably mounted The rolls for carrying out the new skew rolling gripping apparatus e as well as the piece under process consist according to the invention of a treatment'b gripped by or pressed on to the marifreely running conical'part, which preferably is drel is mounted on the pillar c and is set in rota formed of several loose rotatable rings, and an tion by the electromotor 1 whereby the piece unp nd ntly rotata Cy nd part, which der treatment b is fed between the skew rollers. in neral is al o not driven, u h w v p The chuck carrying pillar c is fed forward on the cially h avy ol s. n given s s may be feeding bed 71. by means of a feeding spindle h Y on account of Condition that the set into rotation bya special drive, such-that the comcal part of T Polls Whlch effectsthe draw feeding speed is regulated with reference to the ing, is not driven, and consists of single rotatable angular position and the diameter of the 1m rings any internal overstrain of the material by drical part of the slope rollers and corresponding rotation in the skew rolling is avoided. since the to the stretch ratio of the matrial.

43 running of the conical parts, adapts itself at all points to the circumferential speed of the work piece. The independently rotatable cylindrical 45 In so far as tubes of large diameter are to be rolled and correspondingly'heavy rollers are prof the rollers can also -.part, fastened to the conical art of the rolls, Fh q 9 which in certain cases may be auxiliarly driven beauxlhanly dnven as lnustmtfad diagram effects a complete smoothing and to a'certain matlc mannfir for the-T0119! 1n F u 6t) degree even a polishing of the rolled tube, so that e b 15 then rolled down Wlthout a en 'accgrding t t new prgcess a 11 finished prodnant from the ,mandrel. Inother cases the-skew uct of uniform gauge and of high quality can be rollers are radially displaced from the tube, on obtained. stopping the drive whereupon the tube'which is a there can naturally be provided vice versa 8. ner, if the rear end of the mandrel is formed The shoving forward of the wo piece e e e rea y is removed from the mandrel. 5

small diameter, and tubes of very large diameter can be obtained with any especially thin walls, accurate in the desired dimensions as a product ready for sale in a relatively simple and cheap apparatus. The subsequent working of the tube is unnecessary. Corresponding to the smaller strain on the material, the driving force necessary'is also considerably smaller. .The roller mandrels undergo on account of the steady, uniform rolling only a small strain and can therefore be made of cheap qualities of steel, also with the object of cooling, in certain cases can be formed hollow. The rollers can be made in the usual lathes. Special working machines as are necessary for rollers; are not required. The otherwise necessary stock of calibrated rollers, tools, mandrels, sleeves and spindles is considerably reduced.

For going over to another .tube dimension a change of rolls is not in general necessary rather a change of the mandreL; and an alteration in the roller distance sufli'ces.

I claim: A a 1. A machine for rolling in a single operation a seamless tube having a thin wall from a thick the production of calibrated.

hollow body, comprising a cylindrical mandrel of a length equal at least to the length of the thick hollow body, at least two freely rotatable conical rollers arranged askew to the said mandrel and each formed of a number of separate freely rotatable disc's, means for rotating the.

said mandrel with the thick hollow body mounted on the said mandrel and means for introducing the said mandrel together with the said thick body between the said rollers and forcausing 'a relative longitudinal displacement between the said mandrel and said rollers corresponding to the stretching of the said thick body.

2. A machine for rolling ina single operation a seamless tube having a thin wall from a thick hollow body, comprising a cylindrical mandrel of a length equal at least to the length of the thick hollow body, at least two freely rotatable conical rollers arranged askew to the said mandrel, at least two positively driven cylindrical rollers arranged concentrically with and in rear of said conical rollers, means for rotating the mandrel and the hollow body and means for introducing the mandrel together with the said thick body between the said conical rollers and for causing a'relative longitudinal displacement between the said mandrel and said conical rollers corresponding to the stretching of the said thick body. i

WILHEIM WIDUCH. 

